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wireless
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URL:
https://askubuntu.com/q/951422
Title:
Wifi available networks not showing up suddenly
ID:
/2017/08/30/Wifi-available-networks-not-showing-up-suddenly
Created:
August 30, 2017
Edited: June 12, 2020
Upload:
September 15, 2024
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Reset WiFi after long suspend period
A few months ago some of us discovered the network card (Ethernet) and wifi card would not reconnect if the laptop was suspended for a long period (+2 hours IIRC). For the 8 months prior to that, suspending and resuming worked perfectly.
This script is written for iwlwifi` which is the common Intel driver name. If your’s is different change that name below:
#!/bin/sh
# NAME: /lib/systemd/system-sleep/iwlwifi-reset
# DESC: Resets Intel WiFi which can be flakey after a long suspend.
# DATE: Apr 1, 2017. Modified August 30, 2017.
MYNAME=$0
exit
restart_wifi() {
/usr/bin/logger $MYNAME 'restart_wifi BEGIN'
/sbin/modprobe -v -r iwldvm # This removes iwlwifi too
/sbin/modprobe -v iwlwifi # This starts iwldvm too
# systemctl restart NetworkManager.service
/usr/bin/logger 'systemctl restart NetworkManager.service (SUPPRESSED)'
/usr/bin/logger $MYNAME 'restart_wifi END'
}
/usr/bin/logger $MYNAME 'case=[' ${1}' ]'
case "${1}/${2}" in
hibernate|suspend|pre*)
;;
resume|thaw|post*)
restart_wifi;;
esac
NOTE: Sometimes simply resetting network manager is all that is needed. In that case un-comment the line above by removing #. Then comment out the two lines above it by putting # at the beginning of those two lines.
You’ll need to create this script, called iwlwifi-reset, with sudo powers and save it into the directory /lib/systemd/system-sleep. Then mark it executable using:
chmod a+x /lib/systemd/system-sleep/iwlwifi-reset